package saadadb.admintool.components.input;
/*
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 */    

import java.awt.Component;
import java.text.ParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import javax.swing.text.DefaultFormatter;

/**
 * A regular expression based implementation of AbstractFormatter.
 */
class RegexFormatter extends DefaultFormatter {
	private Pattern pattern;
	private Matcher matcher;
	private Component componentToActive;

	public RegexFormatter() {
		super();
	}

	/**
	 * Creates a regular expression based AbstractFormatter.
	 * pattern specifies the regular expression that will be used
	 * to determine if a value is legal.
	 */
	public RegexFormatter(String pattern, Component componentToActive) throws PatternSyntaxException {
		this();
		setPattern(Pattern.compile(pattern));
		setAllowsInvalid(false);
		this.componentToActive = componentToActive;
	}

	/**
	 * Creates a regular expression based AbstractFormatter.
	 * pattern specifies the regular expression that will be used
	 * to determine if a value is legal.
	 */
	public RegexFormatter(Pattern pattern) {
		this();
		setPattern(pattern);
	}

	/**
	 * Sets the pattern that will be used to determine if a value is legal.
	 */
	public void setPattern(Pattern pattern) {
		this.pattern = pattern;
	}

	/**
	 * Returns the Pattern used to determine if a value is legal.
	 */
	public Pattern getPattern() {
		return pattern;
	}

	/**
	 * Sets the Matcher used in the most recent test if a value is
	 * legal.
	 */
	protected void setMatcher(Matcher matcher) {
		this.matcher = matcher;
	}

	/**
	 * Returns the Matcher from the most test.
	 */
	protected Matcher getMatcher() {
		return matcher;
	}

	/**
	 * Parses text returning an arbitrary Object. Some formatters
	 * may return null.
	 * 
	 * If a Pattern has been specified and the text completely
	 * matches the regular expression this will invoke setMatcher.
	 * 
	 * @throws ParseException
	 *           if there is an error in the conversion
	 * @param text
	 *          String to convert
	 * @return Object representation of text
	 */
	   public Object stringToValue(String text) throws ParseException {
	        Pattern pPattern = getPattern();
	        
	        if (pPattern != null) {
	        	if( text.length() == 0 ) {
	                if( this.componentToActive != null ) {
	                	this.componentToActive.setEnabled(false);
	                }
	                return super.stringToValue(text);
	        	}
	            Matcher mMatcher = pPattern.matcher(text);
	            
	            if (mMatcher.matches()) {
	                setMatcher(mMatcher);
 	                if( this.componentToActive != null ) {
	                	this.componentToActive.setEnabled(true);
	                }
	                return super.stringToValue(text);
	            }
	            throw new ParseException("Pattern did not match", 0);
	        }
	        return text;
	    }	  
	   
}